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The removal of cyhalofop-butyl in soil by surplus Rhodopseudanonas palustris in wastewater purification

Wu, Pan, Mo, WenTao, Chen, Zhaobo, Wang, Yanling, Cui, Yubo, Zhang, Ying, Song, Yantao, Jin, Liming, Hou, Yanxi, Zhu, Feifei, Cao, Bo, Li, Ning
Journal of environmental management 2019 v.245 pp. 168-172
bacteria, carbon, carboxylesterase, energy, gene expression, pollution, remediation, signal transduction, sludge, soil, soybeans, wastewater, wastewater treatment
The biorestoration of cyhalofop-butyl and fertility in soil using Rhodopseudanonas palustris (R. palustris) in the treated wastewater were investigated in this research. Cyhalofop-butyl was not degraded under control group. The treated wastewater containing R. palustris degraded cyhalofop-butyl and remediated fertility. Interestingly, the cyhalofop-butyl-hydrolyzing carboxylesterase gene was expressed after inoculation 24 h. Subsequently, the cyhalofop-butyl-hydrolyzing carboxylesterase were synthesized to degrade cyhalofop-butyl. The cyhalofop-butyl started to be degraded after inoculation 24 h. The cyhalofop-butyl as stimulus signal induced cyhalofop-butyl-hydrolyzing carboxylesterase gene expression through signal transduction pathway. This process took 24 h for R. palustris as they were ancient bacteria. The residual organics in the wastewater provided sufficient carbon sources and energy for R. palustris under three dosage groups. The new method completed the remediation of cyhalofop-butyl pollution, the improvement of soil fertility and soybean processing wastewater treatment simultaneously, and realized the resource reutilization of wastewater and R. palustris as sludge.